JPS61218712A - High temperature hermetical seal material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is an elastic or flexible seal of heat-resistant material formed by compression into the form of a sealing ring and having at least one surface formed as a sliding surface. A high-temperature sealing ring-shaped seal ring that elastically flexibly, universally, and separably seals and connects two pipes, especially single-flow pipes or double-flow pipes that form the conduit of an automobile exhaust system. It is related to materials.

In such known pipe systems, which are described for example in German Patent Publication No. 290 187 for the exhaust pipe of a truck with a horizontal engine, the pipes are connected to each other by means of joints, the joints having a ball-and-socket-like design. A sealing ring is permanently arranged between the sealing surfaces thus created by the conduit and sealing against these surfaces. This seal ring must be able to withstand high exhaust temperatures and pressures, allow for universal relative movement of the conduits, be integrally walled and dimensionally stable, and must Must have excellent bearing properties to avoid wear between the bearings.

In this case, and therefore for the purposes of the present invention, elastic seals having the sliding properties in question and being resistant to high temperatures include mica, mica sheets, graphite, etc., metal fibers, ceramic fibers, metal cuttings, etc. and mixtures thereof, a braid of wire containing such materials;
The seal can be made of a woven or knitted fabric, in which case a metal having sliding bearing properties can be used as part of the wire.

There are still too many problems with known sealing rings, which over time wear out the sealing surface of the conduit and create squeaking noises.
This noise is particularly unpleasant.

Additionally, this wear can result in damage to the sealing surfaces and burn-out of portions of the sealing ring, so when replacing a defective sealing ring it is often a tedious task to separate the sealing surface from the tight sealing member. must be done.

Additionally, known seal rings tend to cave in due to wear and densification of the material. The members, which were initially held at a fixed distance and movable relative to each other by the sealing ring, come into contact with each other, rendering the joint inoperable. Furthermore, the sealing ring loses its sealing effect and must be replaced prematurely. Finally, for example, in the case of a co-flow conduit,
As a result of pressure equilibrium between the exhaust conduits, a large sealing gap must initially be maintained between adjacent bulkheads of the conduits.
Engine efficiency is lost.

The object of the invention is to provide a high-temperature sealing material of the type mentioned above in a simple and difficult-to-finish manner, so that wear and depression of the sealing ring are reduced to a technically negligible extent and the above-mentioned squealing noise is reliably prevented. There is no labor involved, saving materials and therefore lower manufacturing costs.

According to the invention, at least seven supports are arranged in the sealing ring, or the sealing ring is partly constituted by these supports, and the supports are in a compressed state. This is solved by exhibiting greater strength or hardness than the sealed body.

The method according to the invention has the advantage that the following tasks, which were hitherto only undertaken by seals, are separated from one another in function. namely, the challenges of supporting static and dynamic bearing stresses and the inclusion of sealing functions. In this case, the bearing stresses are taken up only by the supports, which retain their shape, whereas the sealing body only has to carry out its sealing action with its inherent elasticity. This separation of issues greatly reduces seal ring wear and caving and also limits the generation of noise, especially squealing. This is because the relatively strong support removes the spring action of the seal ring by the volume it occupies, so that the friction pair on the opposing surfaces of the seal ring is much less likely to oscillate. Since the stick-slip phenomenon seen up to now is prevented, the acoustic stimulation is significantly reduced. In addition, the frictional stress generated by rocking is not applied over a large area, but is essentially applied only to a narrowly limited pressure surface of the support, and the rocking is diffused from this pressure surface, but is attenuated at that time. . Furthermore, locally excited and widespread oscillations are partially canceled by the interference effect. Finally, 1. The non-uniform stiffness distribution due to the difference in compression between the seal ring and the support and between the supports contributes to sound attenuation.

As long as the sealing ring has only one support, this support can be configured as a circulating structure inside the sealing ring. If multiple supports are provided, these supports are preferably evenly distributed along the circumference of the sealing e-ring.

. Maintain a distance of 5-30%.

The support can be formed into spheres, disks, prisms, irregularly contoured granules, etc., depending on the conditions in each case and the availability of suitable materials. In this case, the shape of at least part of the surface of the carrier is adapted to the adjacent surface of the sealing ring in such a way as to perform the task particularly locally.

Generally, it is desirable that the support be made of a pressure- and heat-resistant material.

Also, when the support is in contact with the sliding surface formed by the conduit, it is desirable that the material of this support has rapid running properties.

Suitable materials for the support include metals, ceramics, minerals (rocks), glasses, solid grease materials, sintered materials, etc., depending on the requirements of the application.

The manufacturing of the seal ring of the invention is not difficult compared to known processes. This is because the support is introduced as a protection and is compression molded together during the manufacture of the sealing ring. However, it is also possible, for example, to press the support into specific locations on the sealing ring.

In a preferred embodiment of the invention, a seal ring was made with seven steel balls evenly distributed and pressed together in a mica filler along the periphery.

This sealing ring is surrounded by a wire knitted fabric mantle and has a graphite foil on the sliding surface just inside this mantle to improve the sliding action.

In another preferred embodiment, the sealing material is present essentially only in the area of the sliding surface, from which the support is configured to partially interlock with the sealing material and partially extend exposed. can.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to embodiments shown in the drawings.

FIG. 1 shows a co-pipe exhaust conduit in which both exhaust pipes are connected by an outflow socket l. The cylindrical tip λ of this socket projects into the socket 3 of the connecting socket holder of the following conduit 3. The tip λ has a cylindrical outer surface forming a sealing surface, while the socket 3 has a spherical inner surface as an opposing sealing surface.

A seal seal 6 is inserted between these sealing surfaces. The sockets / and l are elastically and releasably connected by radial flanges and spring elements 9, 10 which abut these flanges against each other.

FIG. 2 shows an enlarged view of the sealing ring 6 according to FIG. According to this, the Sea 12/+1 ring includes a coating made of a braided body of metal wire, a woven fabric, a knitted fabric, etc., an inorganic fiber as an elastic sealing body, such as aluminum silicate fiber, scaly mica, etc. It is made up of a filler made of graphite, etc. Although not shown, a foil of mica material can also be stretched over the inner surface of the covering 11.

Inside its cross section, the sealing ring 6 has a support /,
7. 11,l, the support 13 is configured as a ring, whereas the support IQ has a granular irregular shape. As can be seen from the figure, the support /3 is stretched over all three sealing surfaces of the ring 6, whereas the support 11 is at a constant distance /! from the outer sealing surface. has. From this K, the outline of seal ring O and support body 1
The amount of filler material between 3 and llI is specified,
This also specifies the elastic behavior of the respective sealing ring or the immediacy of the supporting action of the supports /3 to /da.

The support can be constructed of metal. In that case, if the support is to be combined with the sealing surface of the joint shown in FIG. 7, metals with sliding bearing properties are particularly suitable. However, the support can also consist of inexpensive materials such as ceramics, minerals (rocks), glass, etc.

[Brief explanation of drawings]

FIG. 1 is an axial sectional view of the joint portion of the exhaust conduit, and FIG. 1 is an axial sectional view of the seal ring. 6... Seal ring, //... Covering body, l-...
- Filler, /p, /41... Support, 13... Spacing.

Claims (1)

[Claims] 1. A sealing ring in the form of a sealing ring with at least one jacket surface formed as a sliding surface, an elastic and flexible sealing body as a heat-resistant material, the sealing ring being formed by pressure. High-temperature sealing material for elastically, flexibly, universally, releasably, hermetically connecting two pipes, particularly single-flow pipes or double-flow pipes forming the conduit of an automobile exhaust system. at least one support (13, 14) is arranged in the sealing ring (6), or the sealing ring is partly constituted by this support, and the support is in a compressed state. A high-temperature sealing material characterized in that it is stronger or harder than the aforementioned sealing body (12). 2. In the case of a plurality of supports (13, 14), these supports are evenly distributed along the outer circumference of the sealing ring (6). High temperature sealant. 3. The cross section of the support (13, 14) is the seal ring (6
) extends at least into the vicinity of one or more outer surfaces of the
Alternatively, the high-temperature sealing material according to claim 1 or 2, characterized in that said surface partially constitutes. 4. Claim characterized in that the supports (13, 14) maintain a distance (15) from one or more outer surfaces of the sealing ring of approximately 5% to 30% of the thickness of the sealing ring. The high-temperature sealing material according to any one of items 1 to 3. 5. The support according to any one of claims 1 to 4, characterized in that the support is formed in the shape of a sphere, ring, disk, prism, irregularly contoured granules, etc. High temperature sealant. 6. Claims 1 to 5 characterized in that the support adapts, with regard to the shape of at least a part of its surface, to the shape of the outer surface of the sealing ring (6) adjacent to this part. The high temperature sealing member according to any one of the above. 7. The high-temperature sealing material according to any one of claims 2 to 6, wherein the supports (13, 14) are made of a pressure- and heat-resistant material. 8. The high-temperature sealing material according to any one of claims 1 to 7, characterized in that the supports (13, 14) exhibit rapid operation characteristics. 9. The high-temperature sealing material according to any one of claims 1 to 8, characterized in that the supports (13, 14) are made of metal. 10. Supports (13, 14) are ceramics, inorganic materials (
9. The high-temperature sealing material according to any one of claims 1 to 8, characterized in that the material is made of glass, glass, or the like. 11. High-temperature sealing material according to any one of claims 1 to 8, characterized in that the supports (13, 14) are made of a solid grease material or a sintered material.